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[PATCH] added an image to the hurd/what_is_the_gnu_hurd page.


From: address@hidden
Subject: [PATCH] added an image to the hurd/what_is_the_gnu_hurd page.
Date: Fri, 31 May 2024 14:11:35 -0400

Hey Samuel, I think it's fairly silly that we have a open_issues/images/ 
directory.  
Why don't we start moving that stuff to $hurd-web-src/images ?  This commit
starts to do that.  I deleted open_issues/images/overview.svg.  Could you
add overview.svg to $hurd-web-src/images ?  I feel like trying to use git to
move around svg files that I have modified a few times is going to be hard
to do.

* hurd/what_is_the_gnu_hurd.mdwn: I added the image media/overview.svg
This page is probably something that is viewed a lot.  People like
images.

* open_issues/anatomy_of_a_hurd_system.mdwn: I moved the image
location from open_issues/images/overview.svg -> media/overview.svg.

* open_issues/images/overview.svg:  I deleted that file.
---
 hurd/what_is_the_gnu_hurd.mdwn            |  37 +-
 open_issues/anatomy_of_a_hurd_system.mdwn |   2 +-
 open_issues/images/overview.svg           | 648 ----------------------
 3 files changed, 35 insertions(+), 652 deletions(-)
 delete mode 100644 open_issues/images/overview.svg

diff --git a/hurd/what_is_the_gnu_hurd.mdwn b/hurd/what_is_the_gnu_hurd.mdwn
index 8315bfff..dc7dd31a 100644
--- a/hurd/what_is_the_gnu_hurd.mdwn
+++ b/hurd/what_is_the_gnu_hurd.mdwn
@@ -11,7 +11,28 @@ License|/fdl]]."]]"""]]
 
 [[!meta title="What Is the GNU Hurd?"]]
 
-The Hurd is the GNU project's replacement for the [[UNIX]] system's [[kernel]].
+The Hurd is the GNU project's replacement for the [[UNIX]] system's
+[[kernel]].  Nowadays, the most popular Unix-like system is GNU/Linux
+(like [GNU Guix System](https://guix.gnu.org)), whose kernel is
+[Linux](https://en.wikipedia.org/wiki/Linux), which has about [8
+million lines of code](https://docs.kernel.org/process/1.Intro.html).
+More if you count the device drivers, which run with full privileges.
+This is what we call a monolithic kernel.  Monolithic kernels are
+typically faster than microkernels, but they can be less secure.  A
+[[microkernel]] has less code running with full privileges, and it can
+be can be more secure, flexible, and robust.
+
+<!-- public domain image
+https://upload.wikimedia.org/wikipedia/commons/6/67/OS-structure.svg
+-->
+[[!img media/microkernel.svg]]
+
+As you can see from the above image, a microkernel provides everything
+a traditional monolithic kernel does, but less code is running with
+full privledges.  It also has a number of [[advantages]]: modularity
+and extensibility, etc.  The Hurd is one of the most exciting [libre
+software](https://www.gnu.org/philosophy/free-sw.html) microkernels
+that exists right now!  You can [[use it now|hurd/running/debian]]!
 
 The Hurd is firstly a collection of protocols formalizing how different
 components may interact.  The protocols are designed to reduce the mutual
@@ -33,13 +54,23 @@ provides the same standard interfaces known from other 
[[UNIX]]-like systems.
 Thus, for a typical user, the Hurd is intended to silently work in the
 background providing the services and infrastructure which the [[microkernel]]
 itself has no business implementing, but that are required for higher level
-programs and libraries to operate.
+programs and libraries to operate. Let's look at an example.
+
+[[!img media/overview.svg]]
+
+Ladybird invokes glibc's `send ()`, which in turn uses the pfinet (or
+lwip) TCP/IP stack, which talks to our device drivers (rump or
+netdde).  In this particular example, everything runs in userspace!
 
 The Hurd supplies the last major software component needed for a complete
 [[GNU_operating_system|running/gnu]] as originally conceived by Richard
 M. Stallman (RMS) in 1983.  The GNU vision directly drove the creation and has
 guided the evolution of the [Free Software Foundation](http://fsf.org/), the
-organization that is the home of the [GNU project](http://gnu.org/gnu/).
+organization that is the home of the [GNU
+project](http://gnu.org/gnu/).
+
+You can read about the current [[status]] of the Hurd, and you can
+[[install it right now|hurd/running/debian]]!
 
 The Hurd development effort is a somewhat separate project from the
 [[Debian_GNU/Hurd|hurd/running/debian]] port.
diff --git a/open_issues/anatomy_of_a_hurd_system.mdwn 
b/open_issues/anatomy_of_a_hurd_system.mdwn
index ed1aaf97..ac5e176e 100644
--- a/open_issues/anatomy_of_a_hurd_system.mdwn
+++ b/open_issues/anatomy_of_a_hurd_system.mdwn
@@ -27,7 +27,7 @@ TCP/IP stack, and others.  The GNU/Hurd system implements 
POSIX with glibc.  Alm
 POSIX calls to glibc are re-routed to the Hurd servers.  Some of the Hurd 
servers
 depend on GNU Mach, while other Hurd servers depend on other Hurd servers.
 
-[[!img images/overview.svg]]
+[[!img media/overview.svg]]
 
 
 # Bootstrap
diff --git a/open_issues/images/overview.svg b/open_issues/images/overview.svg
deleted file mode 100644
index bd47da91..00000000
--- a/open_issues/images/overview.svg
+++ /dev/null
@@ -1,648 +0,0 @@
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-- 
2.45.1




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